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Internet Searching

Group Members

Nashfa1

Zabir2

Visala3

Azhar4

Zaha5

Contents

Introduction1

Directories2

Search Engines 3

MetaSearch Engines 4

Search Strategies 5

Introduction

With the arrival of the WWW came the widespread availability of online

information

Answers to your questions are somewhere on the web, but how do

you locate them?

DIRECTORIES

• Method of finding and organizing web information

• Offers a hierarchical representation of hyperlinks to web pages and presentations broken down to topics and subtopics

• Review and classified by human editors

Directories : classification

General Specialized

• Also called web directory or subject directory

• Top level provides a wide range of broad topics. E.g. Music / Entertainment.

• Also called subject guides or gateway pages

• Deals with a variety of topics. E.g. law, medicine.

BenefitsEasy to use

Need not know what you are looking for

Search Engines : introduction

• A computer program• Submit a query describing the

information you want to locate• Searches its databases to try and

match your query• Collates and returns a list of URL’s

which matches your query• Permits you to revise and resubmit

a query

Search engines : classification

General Specialized

• Also called vertical search engine or a topic search engine

• Retrieves information from a database that contains information on a wide variety of topics

• Provides in-depth information on specific topics that may be valuable

• Exists for a multitude of topics• MP3s• Shopping• News etc

Not as easy to use as directories. WHY??

Metasearch Engines

• Does not have their own database of information

• Calls many search engines to do the actual work

Advantage:

You can access a number of different search engines with a single query

Disadvantage:

You will get a lot of results which will not be of interest to you. Therefore you will spend a lot of time evaluating the results and deciding which link to follow

Directories and search engines : Popular

MetaSearch Engines

Directories Search Engines

Boolean Queries : AND operator

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BB

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B B

Boolean Queries : OR operator

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BB

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B B

Search Strategies

• Determine which search engine• Possesses a user-friendly interface• Has a easy-to-understand, comprehensive

documentation• Is convenient to access; that is you do not

have to wait several minutes before being able to submit a query

• Contains a large database• Does a good job in assigning relevancy

scores

Exercise

THANK YOU